EP0350712B1 - Method and device for measuring a mass flow - Google Patents

Method and device for measuring a mass flow Download PDF

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Publication number
EP0350712B1
EP0350712B1 EP89111716A EP89111716A EP0350712B1 EP 0350712 B1 EP0350712 B1 EP 0350712B1 EP 89111716 A EP89111716 A EP 89111716A EP 89111716 A EP89111716 A EP 89111716A EP 0350712 B1 EP0350712 B1 EP 0350712B1
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EP
European Patent Office
Prior art keywords
measuring tube
excitation
situated
measuring
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89111716A
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German (de)
French (fr)
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EP0350712A1 (en
Inventor
Hans-Martin Dr. Ricken
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Fischer and Porter GmbH
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Fischer and Porter GmbH
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8422—Coriolis or gyroscopic mass flowmeters constructional details exciters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
    • G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits

Definitions

  • the invention relates to a method according to the preamble of claim 1 and an apparatus for performing the method.
  • EP-A-0263 719 it is known to set two tubes running parallel to one another in opposite directions in a plane containing their two axes and to compare the phases of these vibrations on both sides of the maximum amplitudes of the vibrations lying in the middle of the longitudinal direction of the tubes to determine the mass flow of the medium flowing through both pipes.
  • FR-A-2 598 801 it is known to periodically compress and release a measuring tube clamped at both ends in the central region from opposite sides. The resulting deformations of the measuring tube on both sides of its central area are measured and compared with one another. A signal is derived from the comparison, which corresponds to the mass flow of the medium flowing through the measuring tube.
  • the object of the invention is to provide a method and a device of this type which are as free as possible of vibrations forced on them from the outside in the measurement result.
  • the measured value signal is essentially derived from the difference in the relative phases.
  • a particularly stable device is specified in claim 4.
  • a measuring tube 2 is shown, which is clamped coaxially in two ends 4 and 6 by means of clamping members 8 and 10 in the ends of a support tube 12, the mass of which is large compared to the mass of the measuring tube 2. Both tubes 2 and 12 are straight.
  • exciting elements 14 and 16 are on the measuring tube 2 and in the carrier tube 12 exciting elements 14 and 16 to be interacted, by means of which the measuring tube 2 within the carrier tube 12 in torsional vibrations about the axis of the at rest located measuring tube 2 are to be moved.
  • sensor elements 18, 20, 22, 24 are arranged in the center on the measuring tube 2 or in the carrier tube 12.
  • the sensor elements 18, 20 detect a phase of the torsional vibrations of the measuring tube relative to a fixed reference phase, and the sensor elements 22, 24 do the same.
  • the corresponding measured values arrive in an evaluation circuit 26 and are processed there to form a signal that corresponds to the mass flow of the straight measuring tube 2 corresponds to flowing medium.
  • the difference between the relative phases is essentially formed in the evaluation circuit 26.
  • the sensor elements 18, 20 and 22, 24 also detect the relative radial amplitudes of the measuring tube 2 at the points at which they are attached and also supply corresponding measured values to the evaluation circuit 26. In addition, a signal corresponding to the excitation of the excitation elements 14, 16 is fed to the evaluation circuit.
  • Vibrations of the device which lead between relative movements of the sensor elements 18, 20 and 22, 24 to the center of gravity of the stationary measuring tube 2, or additional bending of the measuring tube 2 or the carrier tube 12 not caused by the torsional vibrations modulate the measured value signal corresponding to the mass flow, averaging several torsional vibrations, thus over the detected relative phases, but delivers a measured value signal which is practically independent of such disturbances and corresponds to the mass flow.
  • the excitation elements 14, 16 need not be in the middle between the clamping points 4, 6, although this is also expedient. The same applies to the middle position of the sensor elements 18, 20 or 22, 24 between the Excitation elements 14, 16 and the clamping points 4, 6.
  • the sensor elements 18, 20 and 22, 24 detect the relative phases preferably at an angular distance of 90 °, although this is also not necessary.
  • the mass flow is proportional to the angular velocity w.
  • the phase difference signal is thus divided by the measured angular velocity w in order to arrive at a value that is independent of it.

Description

Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Anspruchs 1 und eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method according to the preamble of claim 1 and an apparatus for performing the method.

Nach der EP-A-0263 719 ist es bekannt, zwei parallel zueinander verlaufende Rohre in einer ihre beiden Achsen enthaltenden Ebene in gegensinnige Schwingungen zu versetzen und die Phasen dieser Schwingungen beidseitig der in der Mitte der Längsrichtung der Rohre liegenden Maximalamplituden der Schwingungen miteinander zu vergleichen, um den Massestrom des durch beide Rohre strömenden Mediums zu ermitteln.According to EP-A-0263 719 it is known to set two tubes running parallel to one another in opposite directions in a plane containing their two axes and to compare the phases of these vibrations on both sides of the maximum amplitudes of the vibrations lying in the middle of the longitudinal direction of the tubes to determine the mass flow of the medium flowing through both pipes.

Nach der FR-A-2 598 801 ist es bekannt, ein an seinen beiden Enden eingespanntes Meßrohr im Mittelbereich von einander gegenüberliegenden Seiten periodisch zusammenzudrücken und freizugeben. Die sich daraus ergebenden Verformungen des Meßrohrs beidseitig seines Mittelbereichs werden gemessen und miteinander verglichen. Aus dem Vergleich wird ein Signal abgeleitet, das dem Massestrom des das Meßrohr durchströmenden Mediums entspricht.According to FR-A-2 598 801, it is known to periodically compress and release a measuring tube clamped at both ends in the central region from opposite sides. The resulting deformations of the measuring tube on both sides of its central area are measured and compared with one another. A signal is derived from the comparison, which corresponds to the mass flow of the medium flowing through the measuring tube.

Aufgabe der Erfindung ist es, ein Verfahren und eine Vorrichtung dieser Art anzugeben, die im Meßergebnis möglichst frei von ihnen von außen aufgezwungenen Vibrationen sind.The object of the invention is to provide a method and a device of this type which are as free as possible of vibrations forced on them from the outside in the measurement result.

Die Lösung dieser Aufgabe ist in Anspruch 1 bzw. Anspruch 4 angegeben.The solution to this problem is specified in claim 1 and claim 4.

In der Auswerteschaltung wird im wesentlichen aus der Differenz der relativen Phasen das Meßwertsignal abgeleitet.In the evaluation circuit, the measured value signal is essentially derived from the difference in the relative phases.

Zur Korrektur und Eichung werden bevorzugt auch noch die Größen nach Anspruch 2 und 3 verwendet.The sizes according to claims 2 and 3 are preferably also used for correction and calibration.

Eine besonders stabile Vorrichtung ist in Anspruch 4 angegeben.A particularly stable device is specified in claim 4.

Die Erfindung wird im folgenden an einem Ausführungsbeispiel unter Hinweis auf die beigefügte Zeichnung beschrieben.The invention is described below using an exemplary embodiment with reference to the accompanying drawings.

In der Zeichnung ist ein Meßrohr 2 dargestellt, das an zwei in Abstand voneinander liegenden Stellen 4 und 6 mittels Einspanngliedern 8 und 10 koaxial in den Enden eines Trägerrohrs 12 eingespannt ist, dessen Masse groß gegenüber der Masse des Meßrohrs 2 ist. Beide Rohre 2 und 12 sind gerade. In der Mitte zwischen den Einspannstellen 4 und 6 befinden sich am Meßrohr 2 und im Trägerrohr 12 in Wechselwirkung zu bringende Erregerelemente 14 und 16, mittels denen das Meßrohr 2 innerhalb des Trägerrohrs 12 in Drehschwingungen um die Achse des im Ruhezustand befindlichen Meßrohrs 2 zu versetzen sind. Zwischen den Erregerelementen 14, 16 und den Einspannstellen 4 und 6 sind mittig miteinander in Wechselwirkung zu bringende Sensorelemente 18, 20, 22, 24 auf dem Meßrohr 2 bzw. in dem Trägerrohr 12 angeordnet. Die Sensorelemente 18, 20 erfassen eine zu einer festen Bezugsphase relative Phase der Drehschwingungen des Meßrohrs,und Gleiches tun die Sensorelemente 22, 24. Die entsprechenden Meßwerte gelangen in eine Auswerteschaltung 26 und werden dort zu einem Signal verarbeitet, das dem Massestrom eines das gerade Meßrohr 2 durchströmenden Mediums entspricht. Im wesentlichen wird in der Auswerteschaltung 26 die Differenz zwischen den relativen Phasen gebildet.In the drawing, a measuring tube 2 is shown, which is clamped coaxially in two ends 4 and 6 by means of clamping members 8 and 10 in the ends of a support tube 12, the mass of which is large compared to the mass of the measuring tube 2. Both tubes 2 and 12 are straight. In the middle between the clamping points 4 and 6 are on the measuring tube 2 and in the carrier tube 12 exciting elements 14 and 16 to be interacted, by means of which the measuring tube 2 within the carrier tube 12 in torsional vibrations about the axis of the at rest located measuring tube 2 are to be moved. Between the excitation elements 14, 16 and the clamping points 4 and 6, sensor elements 18, 20, 22, 24 are arranged in the center on the measuring tube 2 or in the carrier tube 12. The sensor elements 18, 20 detect a phase of the torsional vibrations of the measuring tube relative to a fixed reference phase, and the sensor elements 22, 24 do the same. The corresponding measured values arrive in an evaluation circuit 26 and are processed there to form a signal that corresponds to the mass flow of the straight measuring tube 2 corresponds to flowing medium. The difference between the relative phases is essentially formed in the evaluation circuit 26.

Die Sensorelemente 18, 20 bzw. 22, 24 erfassen überdies die relativen radialen Amplituden des Meßrohrs 2 an den Stellen, an denen sie angebracht sind und führen auch entsprechende Meßwerte der Auswerteschaltung 26 zu. Überdies wird der Auswerteschaltung ein der Erregung der Erregerelemente 14, 16 entsprechendes Signal zugeführt.The sensor elements 18, 20 and 22, 24 also detect the relative radial amplitudes of the measuring tube 2 at the points at which they are attached and also supply corresponding measured values to the evaluation circuit 26. In addition, a signal corresponding to the excitation of the excitation elements 14, 16 is fed to the evaluation circuit.

Vibrationen der Vorrichtung, die zwischen Relativbewegungen der Sensorelemente 18, 20 und 22, 24 zum Schwerpunkt des ruhenden Meßrohrs 2 führen, oder zusätzliche nicht durch die Drehschwingungen hervorgerufene Verbiegungen des Meßrohrs 2 oder des Trägerrohrs 12 modulieren zwar das dem Massestrom entsprechende Meßwertsignal, eine Mittelung über mehrere Drehschwingungen, somit über die erfaßten relativen Phasen, liefert aber ein von solchen Störungen praktisch unabhängiges, dem Massestrom entsprechendes Meßwertsignal.Vibrations of the device, which lead between relative movements of the sensor elements 18, 20 and 22, 24 to the center of gravity of the stationary measuring tube 2, or additional bending of the measuring tube 2 or the carrier tube 12 not caused by the torsional vibrations modulate the measured value signal corresponding to the mass flow, averaging several torsional vibrations, thus over the detected relative phases, but delivers a measured value signal which is practically independent of such disturbances and corresponds to the mass flow.

Die Erregerelemente 14, 16 brauchen nicht in der Mitte zwischen den Einspannstellen 4, 6 zu liegen, wenn dies auch zweckmäßig ist. Gleiches gilt für die Mittellage der Sensorelemente 18, 20 bzw. 22, 24 zwischen den Erregerelementen 14, 16 und den Einspannstellen 4, 6.The excitation elements 14, 16 need not be in the middle between the clamping points 4, 6, although this is also expedient. The same applies to the middle position of the sensor elements 18, 20 or 22, 24 between the Excitation elements 14, 16 and the clamping points 4, 6.

Die Sensorelemente 18, 20 und 22, 24 erfassen die relativen Phasen bevorzugt in einem Winkelabstand von 90°, wenngleich auch dies nicht notwendig ist.The sensor elements 18, 20 and 22, 24 detect the relative phases preferably at an angular distance of 90 °, although this is also not necessary.

Die die Phasendifferenz an den Meßstellen 18, 20 und 22, 24 erzeugende Corioliskraft ist proportional der Umlaufgeschwindigkeit vu des Meßrohrs 2. Da vu = w*r, wobei w die Winkelgeschwindigkeit und r die Amplitude der Drehschwingung des Meßrohrs 2 ist, wird die Amplitude r der Drehschwingung konstant gehalten und w gemessen. Da sich die Winkelgeschwindigkeit w mit dem Massedurchfluß ändert, kann mit dem Verfahren zusätzlich die Dichte des Mediums bestimmt werden.The Coriolis force generating the phase difference at the measuring points 18, 20 and 22, 24 is proportional to the rotational speed v u of the measuring tube 2. Since v u = w * r, where w is the angular velocity and r is the amplitude of the torsional vibration of the measuring tube 2, the Amplitude r of the torsional vibration kept constant and w measured. Since the angular velocity w changes with the mass flow, the method can also be used to determine the density of the medium.

Bei konstanter Amplitude r der Drehschwingung ist der Massefluß proportional der Winkelgeschwindigkeit w. In der Auswerteeinrichtung wird also das Phasendifferenzsignal durch die gemessene Winkelgeschwindigkeit w geteilt, um auf einen von ihr unabhängigen Wert zu kommen.With a constant amplitude r of the torsional vibration, the mass flow is proportional to the angular velocity w. In the evaluation device, the phase difference signal is thus divided by the measured angular velocity w in order to arrive at a value that is independent of it.

Claims (4)

1. A method of measuring the mass flow of a medium, in particular a fluid medium, flowing through a straight measuring tube (2), wherein the measuring tube (2) is clamped in position at two clamping points (4, 6) arranged spaced apart, wherein at an excitation point (at 14, 16) situated between these two clamping points (4, 6) the measuring tube (2) is excited by means of excitation elements (14, 16) to undergo torsional vibrations of a given angular velocity (w) and having a rotational speed (vu) about the axis of the measuring tube (2) situated in the rest condition, wherein a respective phase, relative to a fixed reference phase, of the torsional vibrations of the measuring tube (2) is measured by means of sensor elements (18, 20; 22, 24) at two measurement points (at 18, 20 and at 22, 24), one of which (at 18, 20) is situated between the excitation point (at 14, 16) and one clamping point (4) and the other one of which is situated between the excitation point (at 14, 16) and the other clamping point (6), and wherein a signal of the measured value corresponding to the mass flow is derived in an evaluation circuit (26) from the measured values corresponding to the relative phases, after averaging a plurality of torsional vibrations.
2. A method according to Claim 1, wherein, moreover, the relative radial amplitudes of the measuring tube (2) are measured at the measurement points (at 18, 20 and at 22, 24) and measured values corresponding to these relative radial amplitudes are fed to the evaluation circuit (26).
3. A method according to Claim 1 or 2, wherein, moreover, a signal corresponding to the excitation frequency is fed to the evaluation circuit (26).
4. An apparatus for carrying out the method according to any one of the preceding Claims, wherein the measuring tube (2) is clamped in a support tube (12) which surrounds it coaxially in the rest condition and the mass of which is large in relation to the mass of the measuring tube (2), and wherein excitation elements (14, 16) to be brought into interaction with one another at the excitation point (at 14, 16) and sensor elements (18, 20; 22, 24) at the measurement points (at 18, 20, at 22, 24) are applied to the outside of the measuring tube (2) and to the inside of the support tube (12), the excitation elements (14, 16) being so arranged that they induce the torsional vibrations of the measuring tube (2) about the axis of the measuring tube (2) situated in the rest condition.
EP89111716A 1988-07-15 1989-06-27 Method and device for measuring a mass flow Expired - Lifetime EP0350712B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3824111A DE3824111A1 (en) 1988-07-15 1988-07-15 METHOD FOR MEASURING THE MASS CURRENT OF A MEDIUM AND DEVICE FOR IMPLEMENTING THE METHOD
DE3824111 1988-07-15

Publications (2)

Publication Number Publication Date
EP0350712A1 EP0350712A1 (en) 1990-01-17
EP0350712B1 true EP0350712B1 (en) 1992-08-19

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EP89111716A Expired - Lifetime EP0350712B1 (en) 1988-07-15 1989-06-27 Method and device for measuring a mass flow

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US (1) US4972724A (en)
EP (1) EP0350712B1 (en)
DE (2) DE3824111A1 (en)

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US5097698A (en) * 1990-06-19 1992-03-24 University Of Delaware Detection method for determining phase boundaries
EP0469448A1 (en) * 1990-07-28 1992-02-05 KROHNE MESSTECHNIK MASSAMETRON GmbH & Co. KG Mass flow meter
DE4124295A1 (en) * 1991-07-22 1993-01-28 Krohne Ag MASS FLOW MEASURING DEVICE
EP0547455B1 (en) * 1991-12-19 1996-09-18 Krohne AG Mass flow rate meter
US5323658A (en) * 1992-06-19 1994-06-28 Fuji Electric Co., Ltd. Coriolis mass flowmeter
FR2707395B1 (en) * 1993-07-09 1995-10-06 Facom Torque measurement tool, such as an electronic torque wrench.
US5392656A (en) * 1993-09-14 1995-02-28 Lew; Hyok S. Nonvibrating conduit inertia force flowmeter
EP0905488A3 (en) * 1997-09-30 1999-04-21 Yokogawa Electric Corporation Coriolis mass flowmeter
JP2003185482A (en) * 2001-12-17 2003-07-03 Yokogawa Electric Corp Coriolis mass flowmeter
US7299705B2 (en) * 2003-07-15 2007-11-27 Cidra Corporation Apparatus and method for augmenting a Coriolis meter
US7389687B2 (en) 2004-11-05 2008-06-24 Cidra Corporation System for measuring a parameter of an aerated multi-phase mixture flowing in a pipe
US7690266B2 (en) 2008-04-02 2010-04-06 Expro Meters, Inc. Process fluid sound speed determined by characterization of acoustic cross modes
LV14688B (en) 2011-11-22 2013-09-20 EĻEVS Jurijs KOŠCoriolis-type mass flowmeter having a straight measuring tube
DE102013020454B4 (en) * 2013-12-06 2021-02-18 Festo Se & Co. Kg Method for determining a mass flow rate
NO20220264A1 (en) * 2022-03-02 2023-09-04 Cignus Instr As Mass flow meter

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US3329019A (en) * 1964-10-26 1967-07-04 Anatole J Sipin Mass flow metering means
GB8304783D0 (en) * 1983-02-21 1983-03-23 Shell Int Research Coriolis-type mass flow meter
US4622858A (en) * 1985-03-25 1986-11-18 The Babcock & Wilcox Company Apparatus and method for continuously measuring mass flow
FR2598801A1 (en) * 1986-05-13 1987-11-20 Assistance Indle Dauphinoise A Mass flowmeter with multimode elasticity
GB8705758D0 (en) * 1987-03-11 1987-04-15 Schlumberger Electronics Uk Mass flow measurement
US4879910A (en) * 1987-07-10 1989-11-14 Lew Hyok S Torsional vibration convective inertia force flowmeter

Also Published As

Publication number Publication date
EP0350712A1 (en) 1990-01-17
DE3824111A1 (en) 1990-01-18
DE58902074D1 (en) 1992-09-24
US4972724A (en) 1990-11-27

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